I just got a 99 E300, Amazing car!!, but the PO removed the EGR and I don't have the part to reattach it. So I thought the easy solution would be to build the circuit outlined

here
got it this time - egr bypass 606 turbo

and here
http://www.superturbodiesel.com/std/w210-om606-962-egr-delete-t-1871.html

(thank you KarTek) and be done with the limp mod. but for some reason the code is not clearing. The car has been started and run to operating temps half a dozen times, but still not luck. I'm going to try disconnecting the battery in a second to see if that helps.
I know the circuit is right, is their something I'm missing?

What's crazy is that even on limp mode that car pulls like a freight train, till it realizes it's going fast and dials down the fun